JPS59198176A - Printer - Google Patents

Abstract

PURPOSE:To provide a printer easy to assemble, high in strength of a frame and simple in construction, wherein left and right frames are connected to each other by a platen, a carrier guide shaft and an ink ribbon base, and a driving shaft for a carrier is fitted to the frames. CONSTITUTION:In a printer for printing on a receipt paper or the like, the left and right frames 1a, 1b are integrally connected to each other by the platen, the carrier guide shaft 16 and the ink ribbon fitting base 5 to enhance the strength of the frames. The driving shaft 25 for the carrier which shaft is provided with a spiral groove 26 and reciprocates a printing head 3 is rotatably fitted to the frames by a means, e.g., by inserting it into recessed parts 38 of the frames 1 so that the shaft 25 can be easily fitted in and drawn out. Accordingly, assemblage of the printer is facilitated.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a printer that is easy to assemble.

(Technical background of the invention and its problems) In addition to a platen and a print head, a printer that uses an ink ribbon system includes an ink ribbon mounting base that supports an ink ribbon spool, and the print head is mounted on a carrier that moves parallel to the platen. mounted on. In addition, a carrier drive shaft for reciprocating the carrier and a carrier guide shaft for guiding the carrier must be attached to the frame, which requires strength of the frame, making the configuration complex and difficult to assemble. there were.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose is to provide a printer that is easy to assemble, has a strong frame, and has a simple configuration.

(Summary of the Invention) A printer according to the present invention includes left and right frames, a platen that connects both frames, a carrier guide shaft, an ink ribbon mount, and an endless spiral groove on the outer periphery that rotates between the two frames. A carrier drive shaft that supports a freely supported carrier drive shaft, supports a print head so that the print head faces the platen, engages with a spiral groove of the carrier drive shaft, and is guided by the carrier guide shaft. The present invention is characterized by comprising a carrier that reciprocates in parallel with the platen as the platen rotates.

With the above configuration, the left and right frames are the platen,
They are connected by a carrier guide shaft and an ink ribbon mount, and the carrier drive shaft is rotatably supported between both frames. To assemble this, first connect the left and right frames with a platen, and then connect the carrier guide shaft with the carrier attached. However, it can be easily assembled by connecting the two frames, attaching a carrier drive shaft between both frames, engaging the carrier in the spiral groove of this drive shaft, and then attaching the ink ribbon mounting base. Furthermore, both frames are firmly connected by the platen, carrier guide shaft, and ink ribbon mount, providing sufficient strength and simplifying the configuration.

[Embodiments of the invention] An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 shows the appearance of a printer that prints on rolled receipt paper and journal paper.
are left and right frames, 2 is a paper holder that stores receipt paper and journal paper for supply, 3 is a print head, and 4
5 is a platen, 5 is an ink ribbon mounting base with ink ribbon spools 6a and 6b attached, and both spools 6a,
The ink ribbon 6 is wound alternately between the ink ribbons 6b.

Further, 7 is a paper supply guide, and 8 is a rotatably mounted stamp mounting plate.

The paper holder 2 is provided with a winding shaft 9 for winding up the printed journal paper. The platen 4 has a medium paper guide 1 that guides the journal paper to the winding shaft 9.
0 is provided, and a stamp pad 1 is provided on the side of this guide 10.
1 is integrally formed. Further, a stamp 13 that moves forward and backward while being guided by a stamp guide 12 is attached to the stamp mounting plate 8 so as to face the stamp base 11, and a lever 11 connects the stamp 13 and a cutter (not shown).
An electromagnetic plunger 15 is mounted which is driven via 4.

The print head 3 is attached to a carrier 17 which is slidably attached to a carrier guide shaft 16 as shown in FIG. ``The left and right frames 1a and 1b are
The ink ribbon mounting base 5, carrier guide shaft 16, platen 4, and paper supply guide 7 are integrally connected. The ink ribbon mount 5 connects the front ends of the frames 1a and 1b. In other words, the left and right frames la
.

1b has four through holes 1 at each front end as shown in Fig. 2.
The ink ribbon mount 5 has a pair of through holes 19 in each of its left and right legs.

Therefore, when using narrow paper, the through holes 19 of the ink ribbon mount 5 should be
8, and when using wide paper, both are screwed from above in alignment with the inner through hole 18.

The carrier guide shaft 16 connects the connecting pieces 20 formed at the intermediate portions of the frames 1a and 1b.

5- That is, the carrier guide shaft 16 has screw holes at both shaft ends. The carrier guide shaft 16 is inserted between the connecting pieces 20 and screwed from the side of the connecting pieces 20, so that the connecting pieces 20 are connected at a predetermined interval. The platen 4 is connected by screwing bent pieces 21 provided at the rear ends of the frames 1a and 1b from above.

The ink ribbon spool 6 is attached to the ink ribbon mounting base 5.
A spool stand 22a for loading a and 6b.

22b and the spool stands 22a, 22b are selectively driven by a fixed amount at a time. A ribbon feeding mechanism 23 is provided. The ribbon feeding mechanism 23 is bent into a mouth shape and connects to the connecting portion 2.
4, and is made to protrude to the outside of the ink ribbon mounting base 5.

A carrier drive shaft 25 for reciprocating the carrier 17 along the carrier guide shaft 16 is attached below the carrier guide shaft 16 .

This shaft 25 has an endless spiral groove 26 on its outer periphery, and a cam follower 26a provided on the carrier 6-17 is engaged in this spiral groove 26 as shown in FIG. By doing so, the carrier 17 is moved back and forth.

Returning to FIG. 1 again, there is a gear 27 on the outer surface of the frame 1b.
, 28, 29, an eccentric gear 30, etc. are arranged.

The gear 27 is attached to the end of the carrier drive shaft 25, and the rotational force of this gear 27 is transferred to the eccentric gear 3.
0 to gears 28, 29. Further, an electromagnetic plunger 31 is attached to the outer surface of the frame 1b, and an armature 32 that is normally moved by the plunger 31 is engaged with an engagement pin 33 protruding from the eccentric gear 30, so that the eccentric gear 30 is connected to the gear 27. It is held in the disengaged position. The eccentric gear 30 can be brought into mesh with the gear 27 by disengaging the armature 32 from the engagement pin 23 by energizing the plunger 31.

Further, one end of a crank lever 34 is pivotally supported on the gear 28 . As shown in FIGS. 3 to 5, the crank lever 34 has a guide bin 35 and a circular engagement part 36 at the other end, and the guide bin 35 is provided on the side plate of the ink ribbon mount 5. It is slidably fitted into the elongated hole 37, and the circular engaging portion 36 is fitted into the mouth-shaped connecting portion 24 of the ribbon feeding mechanism 23. Then, each time the gear 28 rotates once, the connecting portion 24 is reciprocated once,
The ribbon feeding mechanism 23 is configured to rotate either the spool stand 22a or 22b by one pitch each time the connecting portion 24 rotates, thereby feeding the ink ribbon 6. Note that a guide bin 35 is provided at one end of the elongated hole 37.
A large-diameter hole portion 37a is formed as shown in FIG. 5, into which the
A fitting groove 35a into which both edges of the elongated hole 37 are fitted is formed in the guide bin 35 as shown in FIG.

The carrier drive shaft 25 is the left and right frame 1a.

1b as shown in FIGS. 6 and 7.

That is, each frame 1a, 1b is provided with a fitting recess 38 at a position below the connection piece 20 so as to open toward the front, and a fitting recess 38 is provided at both ends of the carrier drive shaft 25 to fit into each fitting recess 38. A matching bearing 39 is attached. Further, an engagement recess 40 is formed at the opening edge of each fitting recess 38, and a retaining plate 41 is provided which is engaged with the engagement recess 40 of the left and right frames 1a, ib. Therefore, the 6th
As shown in the figure, after fitting the bearings 39 at both ends of the carrier drive shaft 25 into the fitting recesses 38 of the left and right frames la, 1b from the front, both ends of the retaining plate 41 are engaged with the engaging recesses 40 of the left and right frames 1a, 1b. By fitting the bearing 39 and holding it in place, it can be installed as shown in FIG. 7. Further, a large-diameter gear 42 is attached to the end of the carrier drive shaft 25 opposite to the gear 27, and this large-diameter gear 42 is configured to be rotationally driven by a motor 43 attached to the inside of one frame 1a. ing.

The ink ribbon mount 5 has a carrier guide 44 bent at a substantially right angle at its front edge as shown in FIG.
A sliding piece 45 that slides on the carrier guide 44 is attached to the lower end of the carrier 17. Therefore, the carrier 17 is guided by the carrier guide shaft 16 and the carrier guide 44, and moves back and forth as the carrier drive shaft 25 rotates.

The paper supply guide 7 is for feeding the receipt paper and journal paper pulled out from the paper holder 2 between the platen 4 and the print head 3, and is provided on the lower guide plate 46 as shown in FIGS. 9 to 11. It is constructed by stacking upper guide plates 47 from above. These guide plates 46.4
7 are both made of synthetic resin, and are curved upwardly to form a concave shape, and a gap is formed between the two guide plates 46 and 47 to allow paper to be inserted through the lower guide plate. Partition walls 48 are formed on both sides and in the middle of the upper surface of the partition wall 46 . The intermediate partition wall 48 separates the receipt paper insertion path from the journal paper insertion path. The lower guide plate 48 includes the left and right frames la,
It is screwed to 1b. In the figure, reference numeral 49 denotes an abrasion prevention body made of a metal plate, which has three arms 50, which are inserted from behind the lower guide plate 46 and attached to the top surface of each partition wall 48. I'm trying to position it.

10- Also, in the figure, 51 is a guide plate made of a thin metal plate, which is attached by being inserted into the front end of the lower guide plate 46, and guides the paper that has passed between the lower guide 46 and the upper guide 47 to the platen 4. This serves to guide the paper between the print head 3 and the print head 3.

In the figure, reference numeral 52 denotes a pair of paper feed rollers, and bearings 54 are attached to both ends of the roller shaft 53 of each roller 52. The roller shaft 53 is disposed on the upper surface side of the upper guide plate 47, and each paper feed roller 52 is introduced into the receipt paper insertion path and the journal paper insertion path through an opening provided in the upper guide plate 47. Further, each bearing 54 has a convex portion 55 as shown in FIGS. 10 and 11, and the lower guide plate 4
A part of the partition wall 48 of No. 6 protrudes to the upper side through an opening provided in the upper guide plate 46, and the protrusion 55 is fitted into the recess 56 formed in this protrusion from above as shown in FIG. I'm letting you do it. Each bearing 54 is pressed from above by the lower end surface of the platen 4, and the lower guide plate 46 is further pressed from above by the bearing 54. The upper guide plate 47 is also held down by the platen 4 as shown in FIG. 11, and the assembly of the paper guide 7 can be completed by attaching the platen 4 to the frames 1a and ib. A ratchet gear 57 is attached to each of the outer ends of the roller shaft 53, and each ratchet gear 57 has a ratchet pawl 58 pivotally supported by the armature 32.
The electromagnetic plunger 31 is configured to rotate by one pitch each time the electromagnetic plunger 31 is energized.

As shown in FIG. 1, a pulley 59 is coaxially provided on the gear 29, and these five pulleys and a pulley 60 attached to the side wall of the paper holder 2 are interlocked via a belt 61. There is. Note that a gear (not shown) coaxial with the pulley 60 is disposed inside the paper holder 2, and this gear has a gear 6 attached to the winding shaft 9.
2 are interlocked. Therefore, each time the electromagnetic plunger 31 is energized and the gear 29 rotates under the rotational force of the carrier drive shaft 25, the winding shaft 9 rotates by a certain amount.

FIGS. 12 and 13 show the attached state of the pinch roller 63, which presses against the paper feed roller 52 from below. In the figure, reference numeral 64 denotes a pinch roller mounting member having a curved cross-sectional shape, and this mounting member 64 has V-shaped image fitting portions 65 at both ends, respectively. In addition, the left and right frames 1a,
lb is provided with a square hole 66 into which both ends of the mounting member 64 are inserted, and at the lower edge of the square hole 66, a V-shaped notch is formed at a portion corresponding to each of the V-shaped image matching portions 65. As shown in FIG.
By engaging with the mounting members 64, the left and right frames la, l
b is rotatably supported. In addition, the mounting member 6
An operating piece 68 for manual operation is formed upward at one end of the 4, and a set of two locking pieces 69 are cut out on the other side where the V-shaped image joining part 65 is not formed. and is formed 1
Furthermore, an engagement hole 70 located between each set of locking pieces 69 and a set of two stopper protrusions 71 are provided. A pinch roller support plate 72 made of an elastic plate is inserted and attached between each set of locking pieces 69. In addition, each pinch roller support plate 72 has an engaging piece 73 cut and raised on the lower surface side in the center, and this engaging piece 73
is attached to the attachment member 64 by being engaged in the engagement hole 70 and having one end abutted against the two stopper protrusions 71. Further, one support piece 74 extends in parallel from the other end of the pinch roller support plate 72, and both support pieces 74 are configured to support the shaft end of the pinch roller 63 from below.

The pinch roller mounting member 64 uses two tension springs 75 to attach the pinch roller 63 to the paper feed roller 5.
2 and is urged to rotate in the direction of pressure contact with 2.

FIG. 14 shows the state in which the stamp mounting plate 8 is attached to the ink ribbon mounting base 5.

That is, the stamp mounting plate 8 has left and right pivot pieces 76, and each pivot piece 76 is rotatably supported on the front end portions of the left and right frames 1a and 1b. Furthermore, engagement recesses 77 are formed on the left and right sides of the tip of the stamp mounting plate 8. This engagement recess 77 has a shallower V on the bottom surface of the recess cut out in the shape of a mouth.
14-shaped recessed portion is formed. On the other hand, the left and right frames 1a.

1b, at the upper end of each of the connecting pieces 20, FIGS.
Each coupling piece 20 has a positioning protrusion 78 that engages with the engagement recess 77 as shown in FIG. Each of the locking members 79a and 79b is integrally formed with an ink ribbon guide 80 on which the ink ribbon 6 is wrapped, as shown in FIGS. 15a and 15b.

One of the locking members 79a extends upwardly, and the engagement recess 7
A locking stepped portion 81 is provided near the stamp mounting plate 7 from above and reliably inhibits upward rotation of the stamp mounting plate 8. The other locking member 79b is also provided with a locking step 82 near the engagement recess 77 that is hooked from above.
This stepped portion 82 is an inclined surface, and the stamp mounting plate 8
It does not have sufficient retention function for Then, when the upper end of one of the engaging members 79a is opened outward and the locking stepped portion 81 is removed from the stamp mounting plate 8, the holding function for the stamp mounting plate 8 is insufficient with the other locking member 79b alone. ,
The stamp mounting plate 8 can be opened upward. That is, the stamp mounting plate 8 can be easily opened by simply removing one of the locking members 79a.

Next, the operation will be explained.

When rolled receipt paper and journal paper are stored in the paper holder 2 and the leading edge of each paper is inserted between the paper feed roller 52 and the pinch roller 63 and the motor 43 is driven, the carrier drive shaft 25 rotates. Also, the electromagnetic plunger 37 is energized, and the armature 32 is connected to the engagement pin 33.
When released, the eccentric gear 30 meshes with the gear 27 attached to the carrier drive shaft 25, thereby transmitting the rotational force of the carrier drive shaft 25 to the gears 28, 29.

When the electromagnetic plunger 31 is intermittently energized, the ratchet pawl 58 pivoted on the armature 32 feeds the ratchet gear 57 one pitch at a time, thereby allowing the receipt paper and journal paper to pass through the paper supply guide 7 and onto the platen 4. It is sent between the print head 3 and the print head 3. At this time, the guide plate 51 comes to regulate the traveling direction of the paper. The electromagnetic plunger 31, the armature 32, and the ratchet pawl 58 are provided separately on the outer surfaces of the left and right frames 1a and 1b, making it possible to feed receipt paper and journal paper independently.

When the paper is located between the platen 4 and the print head 3, printing can be performed by driving the print head 3. However, for journal paper, the leading edge of the paper must first be fixed to the take-up shaft 9. By doing so, the windings can be wound around the winding shaft 9 one after another. Regarding receipt paper, each time a receipt is issued, the electromagnetic plunger 15 is energized, and the cutter operates to separate the paper at an appropriate position. At the same time, the stamp operates to print a stamp on the starting edge of the next receipt. will be carried out.

Moreover, each time the electromagnetic plunger 31 is energized, the gear 28 is
The ink ribbon 6 rotates, the ribbon feeding mechanism 23 operates, and the ink ribbon 6 is wound one pitch at a time onto one of the ink ribbon spools (for example, 6a). 17- When the ink ribbon 6 is wound up to the end, the tension causes the ribbon feeding mechanism 23 to switch, and the ink ribbon spool (for example, 6b) to be used becomes the winding side.

According to the printer configured as described above, the left and right frames 1a and 1b are connected by the platen 4, the carrier guide shaft 16, and the ink ribbon mounting base 5, and the carrier drive shaft 2
5 is rotatably supported between both frames 1a and 1b, so when assembling this, first
, 1b are connected by the platen 4, the carrier 17 is attached, and the carrier guide shaft 16 is also connected, and the carrier drive shaft 25 is attached between both frames.
It can be easily assembled by engaging the carrier 17 with the groove 26 and then attaching the ink ribbon mounting base 5.

Furthermore, both frames 1a and lb are firmly fixed by the platen 4, carrier guide shaft 16, and ink ribbon mounting base 5, so that sufficient strength can be obtained and the structure can be simplified.

18- (Effects of the Invention) As described above based on the embodiments, according to the present invention, it is possible to provide a printer that is easy to assemble, has a high frame strength, and has a simple configuration.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is an external perspective view of the printer, Fig. 2 is an exploded perspective view of the main parts of the printer, and Fig. 3 is a perspective view showing the peripheral part of the ribbon feeding mechanism. , FIG. 4 is a partial sectional view showing the crank lever, and FIG. 5 is a side view showing the connecting portion between the crank lever and the ribbon feeding mechanism.
Figure 6 is an exploded perspective view of the area around the carrier drive shaft, Figure 7 is an assembled perspective view of the same area, Figure 8 is a partial sectional view of the area around the carrier, and Figure 9 is an exploded perspective view of the area around the paper supply guide. , 1st
Figure 0 is an exploded side view showing a part of the same part in cross section, No. 11
The figure is an assembled side view of the same part, Figure 12 is an exploded perspective view of the paper presser roller support mechanism, Figure 13 is a side view of the same part, and Figure 14
The figure is a perspective view showing the surrounding area of the stamp mounting plate, Figure 15a,
16b is a perspective view showing the left and right locking members, and FIGS. 16a and 16b are perspective views showing the relationship between the left and right locking members and the stamp mounting plate. 1a, 1b...Frame, 3...Print head, 4.
...Platen, 5...Ink ribbon mounting stand, 16...
・Carrier guide shaft, 1A...Carrier, 25...
Carrier drive shaft, 26... etc. are full. Applicant's agent Patent attorney Takehiko Suzue

Claims (1)

[Claims] Left and right frames, a platen that connects both frames, a carrier guide shaft and an ink ribbon mount, a carrier drive shaft that has an endless spiral groove on its outer periphery and is rotatably supported between both frames, and a print head. The print head is supported to face the platen, engages with the spiral groove of the carrier drive shaft, and is guided by the carrier guide shaft to reciprocate in parallel with the platen as the carrier drive shaft rotates. A printer characterized in that it comprises a carrier.